21814665641532 has 120 divisors (see below), whose sum is σ = 59007719361360. Its totient is φ = 7019217596160.

The previous prime is 21814665641497. The next prime is 21814665641543. The reversal of 21814665641532 is 23514656641812.

21814665641532 is a `hidden beast` number, since 2 + 1 + 8 + 1 + 4 + 6 + 65 + 6 + 41 + 532 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 41466243 + ... + 41989029.

It is an arithmetic number, because the mean of its divisors is an integer number (491730994678).

Almost surely, 2^{21814665641532} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21814665641532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29503859680680).

21814665641532 is an abundant number, since it is smaller than the sum of its proper divisors (37193053719828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21814665641532 is a wasteful number, since it uses less digits than its factorization.

21814665641532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527273 (or 527262 counting only the distinct ones).

The product of its digits is 8294400, while the sum is 54.

The spelling of 21814665641532 in words is "twenty-one trillion, eight hundred fourteen billion, six hundred sixty-five million, six hundred forty-one thousand, five hundred thirty-two".